LeetCode 171. Excel Sheet Column Number

LeetCode 171. Excel Sheet Column Number

问题来源LeetCode 171. Excel Sheet Column Number

问题描述

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28

问题分析

这道题就是将Excel的列号转化为数字。可以认为是进制的转化。A-Z一共26个，也就是26进制。但是这里没有考虑0，所以要注意以下，代码比较简单。

Java代码

public int titleToNumber(String s) {
int res = 0;

for (int i =0 ; i<s.length(); i++) {
res*=26;
res+=s.charAt(i)-'A'+1;
}
return res;
}

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